Denial of Service (DoS) Affecting quart package, versions [,0.5.0)

Quart is an A Python ASGI web microframework with the same API as Flask

Affected versions of this package are vulnerable to Denial of Service (DoS). There are multiple ways a client can overload a server and deny service to other clients. A simple example can simply be to call an expensive route at a rate high enough that the server's resources are exhausted. Whilst this could happen innocently (if a route was popular) it takes a lot of client resource, there are malicious methods to exhaust server resources.

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

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